Nextcloud File Server? Five Checks After the CODE App Flaw

Nextcloud CODE server flaw

If your company keeps contracts, HR files or tender papers on a self-hosted Nextcloud server, look at one optional add-on today: the built-in Collabora CODE server app (richdocumentscode). A critical flaw in it, CVE-2026-110447 (CVSS 9.2), lets an attacker run commands on the server without logging in. Reported attacks began around 10 September 2026, weeks before the advisory came out on 14 October.

Who needs to act

  • Servers with richdocumentscode older than 26.4.303 (the fixed version was released on 11 September 2026).
  • Standalone Collabora Online, Docker, RPM or DEB installs and Nextcloud All-in-One are not affected, according to Collabora.

Five checks for your IT team

  1. Find every Nextcloud server, including old test and department ones.
  2. Update the CODE app to 26.4.303 or later, or uninstall it. Turning it off is not enough.
  3. Look for PHP files that should not be there and odd proxy.php requests in logs since September.
  4. If something looks wrong, isolate the server, keep logs and check your six-hour CERT-In reporting duty.
  5. Change admin and service passwords, API keys and tokens on that server.

Read the full guide here: Nextcloud CODE Server Flaw: What Indian Firms Must Do Now

Published by Affix Center, a Mumbai-based IT services company. Visit affixcenter.com or see our cyber security services.

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